confstr(3) - NetBSD Manual Pages

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CONFSTR(3)              NetBSD Library Functions Manual             CONFSTR(3)

confstr -- get string-valued configurable variables
Standard C Library (libc, -lc)
#include <unistd.h> size_t confstr(int name, char *buf, size_t len);
This interface is obsoleted by sysctl(3). The confstr() function provides a method for applications to get configu- ration defined string values. The name argument specifies the system variable to be queried. Symbolic constants for each name value are found in the <unistd.h> header. The len argument specifies the size of the buffer referenced by the argument buf. If len is non-zero, buf is a non-null pointer, and name has a value, up to len - 1 bytes of the value are copied into the buffer buf. The copied value is always null terminated. The available values are as follows: _CS_PATH Return a value for the PATH environment variable that finds all the standard utilities.
If the call to confstr is not successful, 0 is returned and errno is set appropriately. Otherwise, if the variable does not have a configuration defined value, 0 is returned and errno is not modified. Otherwise, the buffer size needed to hold the entire configuration-defined value is returned. If this size is greater than the argument len, the string in buf was truncated.
The confstr function may fail and set error for any of the errors speci- fied for the library functions malloc(3) and sysctl(3). In addition, the following errors may be reported: [EINVAL] The value of the name argument is invalid.
The confstr function conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
The confstr function first appeared in 4.4BSD.
The standards require us to return 0 both on errors, and when the value is not set. NetBSD 9.1 April 22, 2010 NetBSD 9.1
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